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Loss of KAI1 messenger RNA expression in both high-grade and invasive human bladder cancers
1Oncology Research Centre, Villa 1, Prince of Wales Hospital, Randwick 2031, Australia.
Abstract:
The molecular mechanisms responsible for metastasis are not fully understood. Recently, expression of the KAI1 gene on human chromosome 11p11.2 was found to be down-regulated in metastatic prostate cancer cell lines compared with normal human prostate, suggesting that KAI1 may be a metastasis suppressor gene. The aim of this study was to investigate whether there is reduced expression of KAI1 in late-stage bladder cancer. Sixty-six paraffin-embedded bladder tissue sections were analyzed for KAI1 mRNA by in situ hybridization. Nineteen of these were from patients with no histological evidence of bladder cancer, and 47 were from papillary transitional cell carcinomas (TCCs); of these, 16 were highly invasive. KAI1 mRNA was highly expressed in the specimens of normal bladder (11 of 11; 100%), inflammatory bladder (5 of 8; 63%), and noninvasive papillary TCCs of grades 1 and 2 (15 of 24; 63%), compared to grade 3 papillary TCCs (1 of 7; 14%) or invasive TCCs (1 of 16; 6%). The differences in expression between local and invasive disease were statistically significant (P
Insights
The KAI1 gene, a potential metastasis suppressor, shows significantly reduced expression in invasive bladder cancer. This down-regulation is strongly linked to advanced disease, suggesting KAI1
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Metastasis mechanisms remain unclear.
- KAI1 gene down-regulation observed in metastatic prostate cancer suggests a suppressor role.
- Investigating KAI1's role in bladder cancer progression is crucial.
Purpose of the Study:
- To determine if KAI1 gene expression is reduced in late-stage bladder cancer.
- To assess the association between KAI1 expression and bladder cancer invasiveness.
Main Methods:
- Analyzed 66 paraffin-embedded bladder tissue sections for KAI1 mRNA.
- Utilized in situ hybridization technique.
- Compared KAI1 expression in normal, non-invasive, and invasive transitional cell carcinomas (TCCs).
Main Results:
- KAI1 mRNA was highly expressed in normal bladder, inflammatory bladder, and non-invasive TCCs (grades 1 and 2).
- Significantly lower KAI1 mRNA expression was found in grade 3 papillary TCCs and highly invasive TCCs.
- Expression differences were statistically significant (P <= 0.01).
Conclusions:
- Down-regulation of KAI1 mRNA is significantly associated with invasive bladder cancer.
- KAI1 may function as an invasion and metastasis suppressor gene in bladder cancer.
- Further research into KAI1's therapeutic potential is warranted.